.22 QEV Air Rifle

Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.
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qwerty
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Thu Aug 05, 2010 10:06 am

Just a quick mashup of random unused parts. Basicly it's a 1/2 QEV piloted with a 1/4 blowgun, chamber is 22mm copper and the barrel is 6mm alluminium sleeved inside 15mm copper piping
The shot done was at around 100 psi and i have yet to crank up the pressure.

Unfortunatly there is only a video because photobucket dosen't accept pictures from my camcorder.




[youtube][/youtube]


The pellets are modified slightly so that the fit the 6mm barrel perfectly.
Velocity? i don't realy know but i'm guessing somewhere in the high 400s low 500s.

Hmmm, 300psi anyone?
Last edited by qwerty on Thu Aug 05, 2010 11:15 am, edited 1 time in total.
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jackssmirkingrevenge
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Thu Aug 05, 2010 10:30 am

Looks good, and yes you need to crank up the pressure :)

Given the fact that you're using barracuda heavies, I would say velocity is more likely in the 200-300 fps range.
hectmarr wrote:You have to make many weapons, because this field is long and short life
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qwerty
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Thu Aug 05, 2010 11:14 am

Nah, much higher than that, i can tell just by shooting it into the air. Maybe 490 then.
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Thu Aug 05, 2010 11:17 am

qwerty wrote:i can tell just by shooting it into the air.
Who needs a chronograph eh?

My 14 ft/lbs Air Arms S410 could only do 300 fps tops with heavy pellets, and that's from a 3,000 psi fill...
hectmarr wrote:You have to make many weapons, because this field is long and short life
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qwerty
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Thu Aug 05, 2010 11:23 am

Who needs a chronograph eh?

My 14 ft/lbs Air Arms S410 could only do 300 fps tops with heavy pellets, and that's from a 3,000 psi fill...
Not me.... nah but i can see it shoot of into the distance and it's much faster comparing it my cheapo airsoft pistol (200fps with .12g bbs)

And 300 fps? Seriously? TBH thats terrible but i suppose hammer valve guns realease a short burst of air and are designed to shoot lighweight target pellets.

And please don't show me a link of the Airforce Condor...

Just ordered a tin of 13.3g bisley target pellets.
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jackssmirkingrevenge
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Thu Aug 05, 2010 11:33 am

qwerty wrote:Not me.... nah but i can see it shoot of into the distance and it's much faster comparing it my cheapo airsoft pistol (200fps with .12g bbs)
Your 0.12g BBs have a horrible ballistic coefficient compared to heavy pellets, so really what you're seeing is that your pellets *slow down* much quicker than the BBs. If you can see the pellet, it's clearly not moving that fast anyway ;)
hectmarr wrote:You have to make many weapons, because this field is long and short life
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qwerty
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Thu Aug 05, 2010 11:37 am

If you can see the pellet, it's clearly not moving that fast anyway
Not neccasserily(SP?) looking right down the barrel you can see things going actually quite fast.
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Thu Aug 05, 2010 11:38 am

Fair enough, I could see 0.22" pellets at 550 fps on a sunny day down the scope, but anyway without chrony results this discussion is moot.
hectmarr wrote:You have to make many weapons, because this field is long and short life
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qwerty
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Thu Aug 05, 2010 11:41 am

Ok, lets end about this fps thing....... 500 fps +-50fps
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Thu Aug 05, 2010 11:43 am

How about "I have absolutely no idea what velocity my projectiles are travelling at, and without actual chronograph results any figures I give are pure speculation" ;)
hectmarr wrote:You have to make many weapons, because this field is long and short life
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qwerty
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Thu Aug 05, 2010 11:44 am

Fine..... :oops: :x
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Thu Aug 05, 2010 11:46 am

Tell you what - shoot at a soup tin, see what penetration you get. I have the same pellets, we can do a comparative test in terms of penetration, and see how it relates to velocity ;)
hectmarr wrote:You have to make many weapons, because this field is long and short life
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qwerty
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Thu Aug 05, 2010 11:55 am

Done that. Straight through.
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Thu Aug 05, 2010 12:15 pm

Steel soup tin, not aluminium soda can, right?

As soon as I have batteries for my chrony I'll let you know ;)
hectmarr wrote:You have to make many weapons, because this field is long and short life
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qwerty
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Thu Aug 05, 2010 12:46 pm

yep steel thai coconut milk can. exactly the same as soup cans.
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